Duplicator rolls



L. J. SAUER DUPLIGATOR ROLLS Dec. 5, 1933.

Filed Feb. 17 1932 LW ffm? L/ `als Patented Dec. 5, 1933 DUPLICATOR ROLLS Louis J.

Sauer, Oak Park, Ill., assigner to Charles ll. Joy, Sr., Chicago, Ill.

Application February 17,

(Cl. 1l-31.6)

9 Claims.

This invention relates to duplicator rolls and method of manufacture, and is particularly applicable to the manufacture of gelatine coated duplicator sheets or strips which are commonly Wound into rolls on suitable spindles and stretched over a printing bed for the purpose of making copies thereon from a suitably prepared original.

In the preparation of these duplicator rolls it 10 is necessary that the duplicating sheets or bands having a gelatine coating thereon should be provided with a suitable apron at each end which will extend some distance beyond the gelatine coating. These aprons are for the purpose of securing the ends of the sheets to the spindles on which the sheets are to be wound. Heretofore it has been the practice to sew on aprons of a suitable material, such as canvas, to the ends of the gelatine-coated sheets and then attach the outer ends of these aprons to the spindles.

In attaching the canvas aprons to the duplicating bands it has been necessary to scrape the gelatine from adjacent the end of the band. The canvas apron is then placed under the edge and a binding strip placed-on top and both apron and binding strip are sewed to the edge of the sheet. The binding strip is necessary to prevent the seam from weakening the paper backing and allowing the apron to be torn therefrom, which 3o frequently happens. Also in using canvas aprons the moisture which is applied to the roll causes the apron to stretch and shrink unevenly and out of alignment with the backing' and the band cannot be evenly wound on the spindles.

The above method further destroys the usefulness of a considerable portion of the gelatine coating as the seam caused by sewing the canvas and binding strip to the Agelatine-coated sheet indents the gelatine coating when it is 40 Wound on the spindle and a considerable length of the sheet is rendered useless for printing purposes.

It is, therefore, an object to provide a suitable method whereby the aprons form a continuation of the sheet supporting the gelatine coating and whereby the coating is not damaged when the sheets are wound on the spindl, which method also provides a considerable savingin the amount of material used as well as in the labor connected with thenecessary operations in preparing the duplicator sheets.

This invention is an improvement over the invention disclosed and claimed in my copending application entitled Means and method for manufacturing duplicator sheets", Serial No.

1932. Serial No. 593,466

567,871, Iiled October 9, 1931. Also, certain subject-matter in this application is disclosed and claimed in the copending application of Carl S. Miner, Serial No. 540,514, led May 27, 1931, entitled Duplicating sheets, and the application of Erick Rosenberg Nielsen, Serial No. 539,419, led May 22, 1931, entitled Aldehyde proteid composition.

The duplicator sheets or strips commonly comprise a duplicating composition consisting substantially of glue, glycerine, and water attached to a backing of treated paper, nbre, cloth, celluloid or other suitable material. Y

As disclosed in the above noted copending application, the backing, which is preferably of paper, is n rst impregnated with a thin glueglycerine-water solution. The surplus impregnating material is then removed and the paper is lacquered onboth sides. Ordinary clear lacquers may be used or a special lacquer including cellulose nitrate or so-called pyroxylin. The strip is then dried and trimmed to a desired width to fit the duplicating machines on which it is to be used.

It is necessary, in the preparation of these strips, to coat one side of the paper with a comparatively thick coating of the duplicating composition and heretofore it has been the practice to lacquer only one side of the backing and to apply the duplicating composition to the unlacquered side because of the diiiicultyin securing satisfactory adherence between the lacquered surface of the paper and the duplicating composition.

In the invention disclosed and claimed in the above-noted copending application, both sides of the paper arelacquered, and in order to cause the duplicating composition to adhere to the lacquered surface, a very thin layer of special adhesive composition which will adhere to the lacquer coating and also to the gelatine-glue duplicating composition, is applied to one side of the lacquer-coated backing. This adhesive is then dried and duplicating composition applied to the adhesive-coated side. The special adhesive preferably contains a solvent for the duplicating compositionand a non-solvent wetting agent for the lacquer surface such as alcohol, together with a glue and plasticizer for glue such as Turkey red oil, glycerine or a glycol. The special adhesive used provides a binding agent which will adhere to the lacquer on the one hand and to the duplicating composition on the other.v By this means the adherence between the lacquered surface of the paper and the duplicating composition, which is applied thereon, results in an extremely firm bond so that the duplicating composition is weaker than the bond between it and the lacquer.

In the process of preparing these duplicating sheets, a continuous strip of backing material is lacquered and then coated on one side with this special adhesive. The duplicating composition is then applied to comparatively long portions of the strip with short alternate portions uncoated. The continuous strip is then cut into lengths by cutting through the uncoated portions in a manner to provide a comparatively short uncoated apron at each end of each gelatine-coated portion. These uncoated aprons are then washed to remove the adhesive therefrom, leaving a completely lacquered apron which may be attached to the spindles around which the sheets may be wound without destroying or in any way injuring any of the gelatine composition. The adhesive may be washed from the apron portions either before or after cutting the strip into lengths.

It is, therefore, an object of the present invention to provide duplicator sheets for winding on spindles in which the aprons therefor are continuous portions of the strip extending beyond the gelatine-coated portions whereby the strips may be wound on the spindles without injuring the gelatine.

A further object is the provision of a method of preparing duplicator strips whereby the backing extends beyond the gelatine coating to form aprons and whereby the aprons are provided with a non-adhesive surface.

It is also an object to provide a duplicator roll in which the cost of manufacture is considerably reduced and the usefulness of the roll increased, and which provides an eflicient method whereby duplicator sheets may be manufactured in continuous strips which may later be cut into sheets having non-adhesive aprons integral therewith.

Further objects will be apparent from the specification and the appended claims.

In the drawing:

Figure 1 is a top plan view of a continuous backing strip having alternate gelatine-coated and uncoated portions and arranged to be cut into lengths to provide duplicator sheets having suitable aprons integral therewith;

Fig. 2 is a fragmentary sectional perspective view of one end of one of the strips and illustrates the method of connecting the apron to a duplicator spindle;

Fig. 3 is a longitudinal sectional View through the duplicating strip and taken on a line corresponding to line 3 3 of Fig. 1, greatly exaggerated for purposes of illustration; and

Fig. 4 is a similar exaggerated longitudinal section after the completion of the process whereby the adhesive has been removed from the apron portion of the strip.

Referring to the drawing in detail, the embodiment illustrated comprises a continuous strip 1 which is preferably of paper but may be any suitable backing material. on both sides with a suitable lacquer illustrated in section in the enlarged views Figs. 3 and 4 and indicated by the reference character 2.

In the preparation of the backing strip to receive the lacquer, the strip is first treated with a suitable impregnating material and then receives a complete coating of the lacquer on both sides. This lacquering is for the purpose of preventing moisture and duplicating ink from penetrating This strip is coatedl into the backing and thereby increasing its tendency to deteriorate during long periods. However, with the strip in this condition, the gelatine coating cannot be applied thereto as the gelatine will not adhere to the lacquer. A coating 3 of adhesive is therefore applied to one side of the lacquered strip. This coating is a very thin layer of special adhesive which will adhere to the lacquer coating and also to the duplicating composition which is later applied thereon. The adhesive is dried and the duplicating composition 4 applied thereto. The strip is then in the condition illustrated in Figs. l and 3 and having alternate gelatine coated and uncoated portions, the uncoated portions of the strip still having adhesive thereon. The use of this special adhesive provides an extremely firm bond so that the duplicating composition is weaker than the bond btween it and the lacquer. The integral uncoated portions provide aprons for the duplicating sheets and may be cut transversely on the dotted lines 5 to provide sheets of the desired length.

'Ihe aprons cannot be secured to the spindles (Fig. 2) and wound thereon with the adhesive still on the aprons, without injury to the rolls. The adhesive is therefore removed from the aprons or uncoated portions of the strip by a suitable washing process whereby the adhesive is completely removed but the lacquer coating remains. The adhesive may be removed either before or after the strips are cut, and the aprons may then be secured to the spindles as shown in Fig. 2 and wound thereon, and the adjacent coils of the strip will not adhere to the lacquered 110 surface.

Heretofore, it has been the practice to sew canvas aprons to the gelatine coated sheets. This has been an expensive and slow process and the seams not only cause the gelatine compo- 115 sition to be indented in several places over a considerable length of the strip, but the imprint of the woven canvas is also indented in the gelatine. It is, therefore, impossible to use that portion of the strip adjacent the aprons for printing 120 purposes, which results in considerable loss and expense. In the present method there is no indentation of the gelatine composition and the smooth lacquered surface of the apron prevents injury to the composition.

Spindles 6 are provided with a groove 7 and the aprons are pressed therein and secured by means of a strip 8 pressed into the groove. lThe entire strip may then be wound on the spindle 6 and the roll may be stored indefinitely without 130 injury to the duplicating composition.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is:

1. The method of preparing a duplicating sheet for winding on spindles comprising applying an adhesive to one side of said sheet over its entire length, applying a duplicating composition to said adhesive and remote from the ends of the sheet and washing all of the exposed adhesive from said sheet.

2. The method of preparing duplicator sheets having integral aprons for attaching to winding spindles comprising applying an adhesive to one side of said sheet, applying a duplicating composition to a a portion of said adhesive coated surface, then removng the exposed adhesive adjacent each end of saidcomposition coating.

3. The method of preparing duplicator rolls 'comprising completely lacquering acontinuous 150 backing strip on .both sides, then applying adhesive to one side, then applying duplicating composition to alternate portions of said strip on the adhesive side, cutting said strip into lengths to provide an apron at each end pf said composition coated portions, and removing the adhesive from the apron portions.

4. The method of preparing gelatine coated strips for duplicator rolls having integral aprons, comprising processing a backing, applying pyroxylin to both sides, then applying adhesive to one side, then applying a gelatine coating to said adhesive and leaving a portion uncoated at each end of said strip, then washing the adhesive from the uncoated ends.

5. The method of preparing duplicator rolls comprising completely lacquering a continuous backing strip on both sides, then applying a continuous layer of adhesive to said lacquer, then applying an interrupted layer oi.' duplicating composition to said adhesive, then removing the. ex-

AVposed adhesive.

6. The method of preparing duplicator rolls comprising completely lacquering a continuous backing strip on both sides, then applying a continuous layer of adhesive to said lacquer, then drying said adhesive, then applying an interrupted layer of duplicating composition to said dried adhesive, then removingthe exposed adhesive.

7. The method of preparing gelatine coated strips for duplicator rolls having integral aprons, comprising processing a backing, applying pyroxylin to both sides, then applying a continuous adhesive to said pyroxylin, then applying an interrupted duplicating composition to said adhesive. then removing the adhesive from por' tions uncoated by duplicating composition.

8. The method of preparing gelatine coated strips for duplicator rolls having integral aprons, comprising applying a continuous coat of lacquer to one side of a strip, then applying a continuous coat of adhesive to said lacquer, then applying an interrupted gelatine coating to said adhesive, then removing the adhesive from the interrupted portions.

9. The method of preparing a duplicating sheet for winding on spindles, comprising applying an adhesive to the said sheet, applying a duplicating composition to a porton of the adhesive, and removing exposed adhesive.

LOUIS J. SAUER. 

